NAME

SYNOPSIS

DESCRIPTION

The
fattach()
function attaches a STREAMS-based file descriptor to a file, effectively
associating a pathname with fildes. The fildes argument must be a
valid open file descriptor associated with a STREAMS file. The path
argument points to a pathname of an existing file. The process must have
appropriate privileges, or must be the owner of the file named by path
and have write permission. A successful call to
fattach()
causes all pathnames that name the file named by
path
to name the STREAMS file associated with
fildes,
until the STREAMS file is detached from the file. A STREAMS file can be
attached to more than one file and can have several pathnames associated with
it.

The attributes of the named STREAMS file are initialised as follows: the
permissions, user ID, group ID, and times are set to those of the file named
by path, the number of links is set to 1, and the size and device
identifier are set to those of the STREAMS file associated with fildes.
If any attributes of the named STREAMS file are subsequently changed (for
example, by
chmod()),
neither the attributes of the underlying file nor the attributes of the
STREAMS file to which
fildes
refers are affected.

File descriptors referring to the underlying file, opened prior to an
fattach()
call, continue to refer to the underlying file.

RETURN VALUE

Upon successful completion,
fattach()
returns 0. Otherwise, -1 is returned and
errno is set to indicate the error.

ERRORS

The
fattach()
function will fail if:

[EACCES]

Search permission is denied for a component of the path prefix, or
the process is the owner of path but does not have write
permissions on the file named by path.

[EBADF]

The fildes argument is not a valid open file descriptor.

[ENOENT]

A component of path does not name an existing file
or path is an empty string.

[ENOTDIR]

A component of the path prefix is not a directory.

[EPERM]

The effective user ID of the process is not the owner of the file named by
path and the process does not have appropriate privilege.

[EBUSY]

The file named by path is currently a mount point or has a STREAMS file
attached to it.

[ENAMETOOLONG]

The size of path exceeds {PATH_MAX}, or
a component of path is longer than {NAME_MAX}.

[ELOOP]

Too many symbolic links were encountered in resolving path.

The
fattach()
function may fail if:

[EINVAL]

The fildes argument does not refer to a STREAMS file.

[ENAMETOOLONG]

Pathname resolution of a symbolic link produced an intermediate result whose
length exceeds {PATH_MAX}.

[EXDEV]

A link to a file on another file system was attempted.

EXAMPLES

None.

APPLICATION USAGE

The
fattach()
function behaves similarly to the traditional
mount()
function in the way a file is temporarily replaced by the root
directory of the mounted file system. In the case of
fattach(),
the replaced file need not be a directory and the replacing file is a STREAMS
file.